Adam, our guide here in the Okavango Delta, hears them well before he sees them. He twists his head slightly and listens to the rustling and crunching of leaves and branches. “Sounds like two, or maybe three”. The trees are thick and the sound of leaves crushing underfoot wisps along our path. Our group of 6 walk in single file, following Adam as he steps forward, stepping around pot holes and hippo poo before stopping abruptly at the edge of a small clearing. The rest of the group creeps forward to have a look. My heart takes a sudden jump as we see them for the first time, rustling and smashing tree branches with their tusks and trunk; two large bull elephants.